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DTC C1438-59: Lost Communication with HV ECU [11/2016 - ]: Procedure

  1. CHECK HARNESS AND CONNECTOR (MOMENTARY INTERRUPTION) 
    1. Using the Techstream, check for any momentary interruptions in the wire harness and connector corresponding to a DTC.

      Refer to CHECK FOR INTERMITTENT PROBLEMS [02/2014 - ]

      Chassis > ABS/VSC/TRAC > Data List 

      Tester Display Measurement Item Range Normal Condition Diagnostic Note
      HV Communication Open Hybrid vehicle communication open detection Error or Normal Error: Momentary interruption
      Normal: Normal      		 -

      Chassis > ABS/VSC/TRAC > Data List 

      Tester Display
      HV Communication Open

      OK

      There are no momentary interruptions.

      HINT: 

      Perform the above inspection before disconnecting any sensors or connectors.

      Result

      Proceed to
      OK
      NG

    Result:  3

    NG 

    See step  3

    Result:  1

    OK 

    See step  2

  2. RECONFIRM DTC 
    1. Turn the power switch off.
    2. Clear the DTCs.

      Refer to DTC CHECK / CLEAR [02/2014 - ]

      Chassis > ABS/VSC/TRAC > Clear DTCs 

    3. Turn the power switch on (READY).
    4. Drive the vehicle at a speed of 15 km/h (9 mph) or more and turn the steering wheel to the right and left.
    5. Check that no CAN communication system DTCs are output.

      Refer to DIAGNOSIS SYSTEM [11/2016 - ]

    6. Check if the same DTC is output.

      Refer to DTC CHECK / CLEAR [02/2014 - ]

      Chassis > ABS/VSC/TRAC > Trouble Codes 

      Result

      Result Proceed to
      DTC C1438-59 is not output. A
      DTC C1438-59 is output. B
      CAN communication system DTCs are output. C

    Result:  1

    A 

    USE SIMULATION METHOD TO CHECK. Refer to  HOW TO PROCEED WITH TROUBLESHOOTING [11/2016 - ] 

    Result:  2

    B 

    REPLACE SKID CONTROL ECU ASSEMBLY. Refer to  REMOVAL [02/2014 - ] 

    Result:  3

    C 

    INSPECT CAN COMMUNICATION SYSTEM. Refer to  HOW TO PROCEED WITH TROUBLESHOOTING [11/2016 - ] 

  3. REPAIR OR REPLACE HARNESS OR CONNECTOR 
    1. Turn the power switch off.
    2. Repair or replace the harness or connector.
    3. Check for any momentary interruptions between the skid control ECU assembly and the hybrid vehicle control ECU assembly.

      Refer to CHECK FOR INTERMITTENT PROBLEMS [02/2014 - ]

      Result

      Proceed to
      NEXT

    Result:  1

    NEXT 

    See step  4

  4. RECONFIRM DTC 
    1. Turn the power switch off.
    2. Clear the DTCs.

      Refer to DTC CHECK / CLEAR [02/2014 - ]

      Chassis > ABS/VSC/TRAC > Clear DTCs 

    3. Turn the power switch on (READY).
    4. Drive the vehicle at a speed of 15 km/h (9 mph) or more and turn the steering wheel to the right and left.
    5. Check that no CAN communication system DTCs are output.

      Refer to DIAGNOSIS SYSTEM [11/2016 - ]

    6. Check if the same DTC is output.

      Refer to DTC CHECK / CLEAR [02/2014 - ]

      Chassis > ABS/VSC/TRAC > Trouble Codes 

      Result

      Result Proceed to
      DTC C1438-59 is not output. A
      DTC C1438-59 is output. B
      CAN communication system DTCs are output. C

    Result:  1

    A 

    END 

    Result:  2

    B 

    REPLACE SKID CONTROL ECU ASSEMBLY. Refer to  REMOVAL [02/2014 - ] 

    Result:  3

    C 

    INSPECT CAN COMMUNICATION SYSTEM. Refer to  HOW TO PROCEED WITH TROUBLESHOOTING [11/2016 - ] 

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